package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    WeChatProperties weChatProperties;

    @Autowired
    UserMapper userMapper;

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Override
    public User login(UserLoginDTO userLoginDTO) {
        String openId = getOpenId(userLoginDTO.getCode());
        //判断是否为null 如果为null 就抛异常
        if (openId==null){
            throw  new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
       User user= userMapper.getOpenId(openId);
        //判断是否是新用户
        if (user==null){
            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.add(user);
        }
        return user;
    }

    //获取OpenId
    public String getOpenId(String code){
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String s = HttpClientUtil.doGet(WX_LOGIN, map);

        //转json
        JSONObject jsonObject = JSON.parseObject(s);
        String appid = jsonObject.getString("openid");
        return appid;

    }

}
